Four Nitrogen Levels and Three Water Management Systems on Rice Yield and Nitrogen Recovery

Abstract

The permanently flooded, and the dry seeded and afterwards permanently flooded treatments produced higher grain yield than intermittent flooding treatments at all nitrogen levels. Rice responded up to 125 kg N/ha irrespective of the water management system. Recovery of applied nitrogen was higher when permanently flooded. The largest proportion of extracted nitrogen occurred in the stems and the lowest in the roots. Flowering was delayed 12 days in the intermittent flooding system at all nitrogen levels as compared to the other two irrigation management systems.